[NTG-pdftex] url links in included pdf documents,

Hello, I have the need to include pdf pages as backgrounds into a latex document. I would like to keep the url-links in these background pdf's. Searching the mailinglists it turns out, that pdftex does strip all links from included pdf's. Has this changed in recent versions? How should one proceed to look for this in the code of pdftex? With regards, __Janko Hauser